Appending features using two feature classes in "memory" using Python in ArcGIS Pro

Question

I have two feature classes that I have created in the "memory" workspace, one of which contains one polygon feature that I would like to append to the other. The schemas of both feature classes differ.

When I run the append geoprocessing tool using a script, and in the immediate Python window, the tool executes fine but the feature isn't appended to the target feature class. Is it possible to append features between two feature classes in the "memory" workspace?

src_layer = r"memory\survey_extent"
tar_layer = r"memory
ew_survey_extent"
arcpy.management.Append(src_layer, tar_layer , "NO_TEST")

blake.terhune · Accepted Answer

If you use the "NO_TEST" option for schema_type, you also need to use the field_mapping parameter to specify which fields can get mapped together. I've never tried NO_TEST without field_mappings but maybe this is the result. Append in memory workspace should work.